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Measuring Concentration

Measuring Concentration. Strength of a Solution. Dilute vs. Concentrated. Dilute – low amount of solute dissolved in solvent Concentrated – high amount of solute dissolved. g/L. One way to measure concentration Grams of solute per Liter of solution. Example.

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Measuring Concentration

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  1. Measuring Concentration Strength of a Solution

  2. Dilute vs. Concentrated • Dilute – low amount of solute dissolved in solvent • Concentrated – high amount of solute dissolved

  3. g/L • One way to measure concentration • Grams of solute per Liter of solution

  4. Example • What is the concentration (in g/L) of a solution composed of 45g of KCl dissolved to form 1.5L of solution?

  5. Example • How many grams of NaOH are dissolved in 500ml of solution with a concentration of 0.75 g/L?

  6. Example • What volume of water is needed to form a 0.25 g/L solution if you start with 15g of CuS?

  7. Parts per Million (ppm) • Milligrams of solute per liter of solution

  8. Example • What is the concentration (in ppm) of a solution made by dissolving 15g of MgO in 250ml of water?

  9. Example • How many grams of CaCl2 are needed to form 200ml of a 25ppm solution?

  10. % by Mass • Mass of solute/ mass of solution x 100

  11. Example • Find the % by mass is 25g of NaCl is dissolved in 150g of water.

  12. Example • What mass of water is needed to form a 15% solution starting with 20g KCl?

  13. Example • What mass of SrO must be dissolved in 500g of water to form a 11% solution?

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